How a Custom Steel Gate Is Built From Drawing to Install
Stand a framing square against the jamb and check the reveal in one continuous line, because a gate that starts out of plumb gets worse, not better, the farther it travels. steel gate fabrication carlsbad preflight sim sets the order deliberately, and every sequence below is the one the shop still runs when the job ties back to Agua Hedionda Lagoon or the back road out past Carlsbad State Beach.
Drawing, then cutting list
A shop drawing fixes the overall height, the tube and picket sizes, the hinge type, and the latch location before any steel is cut. In San Diego County the wind off the marine layer moves a big dual swing, so the drawing carries a wind load note and a clear opening measurement. Once the drawing is signed, the cutting list splits the parts for the frame, the rails, and the infill, and the plasma table marks each tube to length. Square tube gets written first, because it carries most of the load.
Assembly and checking square
Frames are tacked together on a flat table, then checked by measuring corner to corner. Equal diagonals confirm the frame is square, and a small sample overstates the edge when the diagonals differ by more than a quarter inch. The tacks get pulled and reset until the measurements cross clean, and only then does the full weld pass run. Heat shrinks the metal as it cools, so welds alternate location to keep the frame from pulling out of square.
Venting for galvanizing
Hollow tubing needs vent and drain holes before it goes to galvanizing, so molten zinc can flow and trapped air and moisture can escape safely. Galvanizing is done after all welding, because welding through zinc burns off the coating and risks zinc oxide fumes. The holes stay open, not plugged, and the part is dipped once with no skips in the coating.
Paint and cure
Powder coat is sprayed electrostatically onto a grounded part and then cured in an oven, which is why it is applied in a shop rather than on site. A single coat bridges the tube and holds color against the sun off Interstate 5 toward Oceanside. The part comes out hard, even over the weld beads, and the cure takes the set so the gate ships without soft film.
Hang after the footing holds
Gates are hung after post concrete has gained strength, because loading a fresh footing can shift the post out of plumb. A 24 hour set in Carlsbad, CA lets the slurry lock, and the swing gate rides on hinges set with a clear vertical leg. The operator mounts after the hang, with the catch and the release both reachable from the walk, and the gap stays even through a full dual swing cycle.